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Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
Network Technology
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Network Technology

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  • 1. Telecommunications and Networks Rev 7/20/07 rdm
  • 2. Objectives <ul><li>Understand the fundamentals of data communications and the criteria for choosing a communications medium </li></ul><ul><li>Explain how networking media, devices, and software work together to provide data networking services </li></ul>
  • 3. Fundamentals of Telecommunications <ul><li>Communications </li></ul><ul><ul><li>Transmission of a signal by way of a medium </li></ul></ul><ul><li>Signal </li></ul><ul><ul><li>Contains message comprised of data and information </li></ul></ul><ul><li>Communication medium </li></ul><ul><ul><li>Anything that carries a signal between a sender and a receiver </li></ul></ul>
  • 4. Telecommunications and Data Communications <ul><li>Telecommunications </li></ul><ul><ul><li>Electronic transmission of signals for communications </li></ul></ul><ul><li>Data communications </li></ul><ul><ul><li>Electronic collection, processing, and distribution of data </li></ul></ul><ul><li>Telecommunications network </li></ul><ul><ul><li>Connects communications and computing devices </li></ul></ul><ul><li>Networking media </li></ul><ul><ul><li>Anything that carries an electronic signal </li></ul></ul>
  • 5. Characteristics of Telecommunications <ul><li>Analog signal </li></ul><ul><ul><li>Continuously changes over time </li></ul></ul><ul><li>Digital signal </li></ul><ul><ul><li>At any given time is either high or low </li></ul></ul><ul><li>Signal frequency </li></ul><ul><ul><li>Speed at which signal can change from high to low </li></ul></ul>
  • 6.  
  • 7.  
  • 8. Transmission Capacities <ul><li>Bandwidth </li></ul><ul><ul><li>Range of signal frequencies that can be sent over a given medium at the same time </li></ul></ul><ul><li>Broadband media </li></ul><ul><ul><li>Significantly faster than narrowband </li></ul></ul><ul><ul><li>Any media faster than 200 Kbps (kilobits per second) or 2 Mbps (megabits per second) </li></ul></ul><ul><li>Narrowband </li></ul><ul><ul><li>Anything below 200 Kbs </li></ul></ul>
  • 9.  
  • 10. Networking Media <ul><li>Twisted-pair cable </li></ul><ul><ul><li>Cable consisting of pairs of twisted wires </li></ul></ul><ul><li>Repeaters </li></ul><ul><ul><li>Used to boost signal so that it can travel longer distances </li></ul></ul><ul><li>Coaxial cable </li></ul><ul><ul><li>Inner conductor wire surrounded by insulation, a conductive shield, and a cover </li></ul></ul><ul><li>Fiber-optic cable </li></ul><ul><ul><li>Thousands of thin strands of glass or plastic bound together in a sheathing </li></ul></ul>
  • 11.  
  • 12. Networking Media (Continued) <ul><li>Microwave transmission </li></ul><ul><ul><li>High-frequency radio signal that is sent through the air </li></ul></ul><ul><li>Communications satellite </li></ul><ul><ul><li>A microwave station placed in outer space </li></ul></ul><ul><li>Global positioning system (GPS) </li></ul><ul><ul><li>Uses satellites to pinpoint the location of objects on earth </li></ul></ul>
  • 13.  
  • 14.  
  • 15. Networking Media (Continued) <ul><li>Wireless fidelity (Wi-Fi) </li></ul><ul><ul><li>Wireless networking devices that use the 802.11 protocol </li></ul></ul><ul><ul><li>Uses wireless access points </li></ul></ul><ul><li>Bluetooth </li></ul><ul><ul><li>Enables digital devices to communicate wirelessly over short distances </li></ul></ul><ul><ul><li>Communicates at speeds of up to 1 Mbps within a range of up to 33 ft </li></ul></ul><ul><li>Infrared transmission </li></ul><ul><ul><li>Sending signals through the air via light wave </li></ul></ul>
  • 16.  
  • 17. Networking Devices <ul><li>Modems </li></ul><ul><ul><li>Modulates and demodulates signals </li></ul></ul><ul><ul><li>Cable modem </li></ul></ul><ul><ul><ul><li>Provides Internet access over a cable television network </li></ul></ul></ul><ul><ul><li>DSL modem </li></ul></ul><ul><ul><ul><li>Connects digital devices using a digital signal over telephone service (POTS) lines </li></ul></ul></ul><ul><li>Network adapter </li></ul><ul><ul><li>Computer circuit board, PC Card, or USB device </li></ul></ul>
  • 18.  
  • 19. Network Control Devices <ul><li>Hubs </li></ul><ul><ul><li>Used as a central point for connecting a series of computers </li></ul></ul><ul><li>Switches </li></ul><ul><ul><li>Fundamental part of most networks </li></ul></ul><ul><li>Repeaters </li></ul><ul><ul><li>Connect multiple network segments </li></ul></ul><ul><li>Bridges </li></ul><ul><ul><li>Connect two or more network segments </li></ul></ul>
  • 20. Network Control Devices (Continued) <ul><li>Gateway </li></ul><ul><ul><li>A network point that acts as an entrance to another network </li></ul></ul><ul><li>Routers </li></ul><ul><ul><li>Can divide a single network into two logically separate networks </li></ul></ul><ul><li>Wireless access point </li></ul><ul><ul><li>Receives and transmits data to wireless adapters </li></ul></ul><ul><li>Firewall </li></ul><ul><ul><li>Device or software that filters the information coming onto a network </li></ul></ul>
  • 21. Radio Frequency Identification (RFID) Devices <ul><li>Tiny microprocessor combined with an antenna </li></ul><ul><li>Tracks merchandise from supplier to retailer to customer </li></ul>
  • 22.  
  • 23. Summary <ul><li>Telecommunications </li></ul><ul><ul><li>Electronic transmission of signals for communication </li></ul></ul><ul><li>Computer network </li></ul><ul><ul><li>Connects computers for data communications </li></ul></ul><ul><li>Network media </li></ul><ul><ul><li>Cables and wireless signals </li></ul></ul><ul><li>Networking devices </li></ul><ul><ul><li>Modems, network adapters, network control devices, RFID devices, and pagers </li></ul></ul>

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